How to Overclock Intel CPU

Overclocking the Intel CPU is a popular method for improving its performance beyond the manufacturer’s specifications. It involves increasing the clock speed and voltage of the CPU, increasing its processing power. However, overclocking can also pose risks, including potential damage to the CPU and improved power consumption.

This guide desires to deliver an overview of Intel CPU overclocking, including the benefits and risks involved and the steps required to safely and effectively overclock your Intel CPU. Whether you are a computer enthusiast or simply looking to boost the performance of your system, this guide will deliver the facts and tools you need to make informed judgments about overclocking your Intel CPU.

The Basics of Overclocking

To overclock a processor, the user intentionally increases its operation frequency beyond the original stock specifications. This is done because the processor’s frequency significantly affects the effective computational speed of the CPU, and the aim is to enhance the CPU’s performance by increasing its frequency.

  • The CPU frequency is determined by BCLK or base clock speed, multipliers or “core multipliers,” and Vcore or core voltage.
  • The base clock speed is the base frequency of the CPU, usually measured in GHz.
  • A single multiplier for each CPU core is applied to the base clock frequency, resulting in the core frequency commonly measured in GHz.
  • The processor’s primary input voltage is the core voltage. Higher voltage levels are necessary for higher stable CPU frequencies, as faster speeds require more power. However, increasing the core voltage also leads to greater heat output and increased power consumption by the CPU.

In other words, the CPU core frequency is calculated by the formula 

BCLK x Multipliers = CPU Core Frequency. 
For instance, 100 MHz (BCLK) x 44 (Core Multiplier) = 4400 MHz = 4.4 GHz. 

This number, in GHz, is the number you’re most likely to encounter when looking at basic CPU speed specifications.

To increase the CPU frequency during an overclock, the overclocker raises the multipliers in +1 intervals, systematically adding 100 MHz to the processor’s frequency at a time, and then tests for success and stability. This process continues until the limits of what is possible with the hardware are reached.

In addition to adjusting frequencies, the overclocking process may also require raising select voltages and changing other performance settings on the system to maintain stability at high frequencies.

How to Overclock Intel CPU

Fix Your Computer
and resolve Performance issues with
Outbyte PC Repair


What Do You Need to Overclock Your Intel CPU?

To overclock your CPU, you will need the following:

  1. An Intel CPU that supports overclocking: Check your CPU’s specifications to see if it supports overclocking. Intel K-series CPUs are explicitly designed for overclocking.
  2. A compatible motherboard: Your motherboard should support overclocking and have features like an unlocked BIOS/UEFI, voltage control, and a good power delivery system to handle increased power demands.
  3. Sufficient cooling: Overclocking generates more heat, so you need adequate cooling to keep your CPU within safe operating temperatures. You can use a high-quality air cooler or liquid cooling system.
  4. Overclocking software: Various software tools can help you overclock your CPU, such as Intel XTU (Extreme Tuning Utility) or third-party software like MSI Afterburner or CPU-Z.
  5. Patience and caution: Overclocking can be a time-consuming and risky process. It requires patience to gradually increase clock speeds and voltage while constantly testing for stability. You also need to be cautious and aware of the risks involved in overclocking, such as overheating, system instability, and potential damage to your hardware.

CPU Overclocking Checklist

Before attempting to overclock your processor, ensuring your system is ready for the task is essential. However, keep in mind that overclocking comes with certain risks and drawbacks.

First and foremost, overclocking voids the warranty on your processor. There is a risk of damaging the chip if you apply excessive voltage. Additionally, overclocking increases power consumption and heat, so you’ll need to take steps to mitigate these factors. Extreme heat and voltage can also reduce the lifespan of your processor if you push it beyond its reasonable limits.

Fortunately, modern processors have built-in safety mechanisms that can help mitigate these risks. By taking a responsible and sensible approach to overclocking, you can extract more performance from your chip without harming it. Just be sure to take the necessary precautions and stay within reasonable boundaries.

Do I Own an Overclockable CPU?

To begin with, you require a processor that can be overclocked. In the case of Intel, you will need a K-series chip if you intend to increase the processor’s core frequency, which is the most fundamental method of overclocking. K-Series chips have an unlocked multiplier that lets you increase your chip frequency effortlessly. Nevertheless, remember that the maximum overclocks you can obtain from your chip are subject to the silicon lottery’s whims. Some chips overclock better than others, even if they are otherwise identical.

Does My Motherboard Allow Me to Overclock?

You’ll need a Z-series motherboard if you want to overclock the core frequency, as the cheaper B- and H-series motherboards don’t allow you to change the chip’s frequency. The power delivery subsystems of higher-end motherboards are usually more robust, but their performance can still vary. Reading motherboard reviews to find the best option for your needs is essential.

Can My CPU Cooler Keep My Overclocked Processor Cool?

Maintaining your CPU at lower temperatures is crucial to achieving higher CPU overclocks. In addition, ensuring that your computer case has enough ventilation for proper airflow is equally essential.

In general, having more cooling capacity is better. A CPU cooler that can handle 40% more TDP than your CPU’s rating is recommended. However, you can still overclock your chip even with less cooling headroom. Still, its peak temperatures will limit the gains you can achieve. The definition of sufficient cooling may differ based on personal preference. Still, the primary goal should be to avoid thermal throttling. We’ll discuss thermal throttling in more detail shortly.

For Intel, it’s recommended to have a 240mm All-In-One (AIO) liquid cooler (or air cooler equivalent) for all-core overclocking with a modern Core i5. You’ll want a more powerful 280mm AIO or better for higher-end Core i7 and i9 SKUs. However, cooling requirements may vary depending on the generation of the chip being overclocked, so keep that in mind. More sophisticated overclocking methods, such as manipulating turbo ratios or only overclocking a few cores, can also provide additional performance, even with a less powerful cooler. However, monitoring your CPU temperature when dialing in the overclock closely is essential.

Does My Power Supply Have Sufficient Headroom?

Finally, having a high-quality power supply compatible with your system’s components is crucial. However, the specific requirements will depend on your setup. You can use a power supply calculator to get a basic idea of what you need. Still, factor in the maximum overclock frequency and voltage to ensure adequate power delivery. It is essential to have sufficient power headroom and clean power, so don’t try to save money by opting for an inadequate power supply. Note that you don’t necessarily need to purchase the latest ATX 3.0 power supplies to meet these requirements.


To provide an easy-to-follow introduction to overclocking, we’ll begin with Intel’s Extreme Tuning Utility (XTU), available for Windows download. XTU is a free software package specifically created to overclock Intel CPUs. One of the primary benefits of using XTU is that it’s an official tool. It offers a wide range of settings that you can customize to optimize your CPU’s performance. Additionally, XTU provides valuable statistical data that can be helpful, even if you’re not interested in overclocking. As a result, this utility is an excellent resource for gaining insight into your system’s performance.

Baseline Temperatures and Performance

To begin overclocking with Intel’s Windows-based Extreme Tuning Utility (XTU), you must take some baseline readings first to ensure your CPU is ready. Here’s what you need to do:

  1. Launch XTU and navigate to the left-hand menu. Locate the Stress Test option and click on it.
  2. Run the stress test for at least an hour. You can monitor the test or work on something else while it runs.
  3. Towards the end of the hour, check the system information displayed in the window’s base. Take note of the Package Temperature reading.
  4. If your CPU temperature is above 85 degrees Celsius, you only have a little thermal headroom to overclock. It’s recommended to improve your cooling before proceeding any further.
  5. However, suppose your temperature is below 85 degrees Celsius. In that case, you have some thermal wiggle room to push your chip at a higher frequency with relative safety.

By following these steps and taking baseline readings, you’ll be better prepared to determine how much further you can overclock your CPU without risking damage to your system.

Multiplier Tuning

This step provides a step-by-step guide on overclocking your CPU using Intel’s Extreme Tuning Utility (XTU). It focuses on the importance of understanding the components of an overclock to achieve stability. It explains the role of multipliers in determining the CPU speed. Finally, it provides instructions on how to test the overclock’s stability and adjust the multiplier accordingly.

Understanding the Components of an Overclock

  • Although the Basic Tuning tab can be used to overclock the CPU, understanding the different components of an, overclock can make it easier to achieve a stable overclock.Basic Tuning Screen
  • Select the Advanced Tuning tab from the left-hand menu to access the various components of an overclock.
  • Look for the section called Ratio Multipliers, which corresponds to the speed obtained from the CPU.Advanced Tuning and Ratio Multipliers
  • Multipliers are a multiplication of the BCLK frequency, which is the base clock set to 100MHz by default.

Adjusting Multipliers to Overclock the CPU

  • To overclock the CPU, raise the multiplier by one number (x33 in the example) across all cores.
  • While adjusting frequencies individually on different cores is possible, pushing for an all-core overclock is recommended to keep things simple.

Testing the Overclock’s Stability

  • After adjusting the multiplier, test the overclock’s stability by selecting the Stress Test from the left-hand menu and rerunning the test.
  • In this case, check the CPU Stress Test and run the test only needs to be run for 10 minutes.Stress Test Intel
  • If the test completes without issues, increase the multiplier by another step and repeat the process.Stress Test Started
  • Eventually, the test will report a failed result or cause your computer to crash. When this happens, step back to the previous multiplier setting.

Finalizing the Overclock

  • If the final overclock is satisfactory, run extended stress tests and play games for several hours to ensure stability.
  • If the final overclock is unstable, reduce the multiplier and start the stress-testing process again.
  • Once you reach a point where you can use your PC generally at a higher frequency, congratulate yourself on a successful overclock.

Raising the Core Voltage

Overclocking your CPU can improve performance but requires technical knowledge and caution. One way to achieve a higher overclock is by increasing the voltage. However, adjusting the voltage requires more care than changing the multipliers, as too much voltage can damage your CPU. This step will explain the different voltage parameters that can affect your CPU’s operation, the importance of core voltage, and how to adjust it using Intel XTU.

Voltage Parameters

  • Voltage is essential in overclocking and can differentiate between unstable and stable overclocks.
  • Many voltage parameters, including core voltage (VCore), can affect a CPU’s operation.

Importance of Core Voltage

  • Core voltage (VCore) is arguably the most important and impactful parameter.
  • Increasing the VCore can lead to a higher overclock, but it can also damage your CPU if not done correctly.

Adjusting Voltage in Intel XTU

  • Intel XTU offers multiple ways to adjust the voltage of your CPU.
  • We recommend using the Core Voltage slider to set a specific value. 
  • The Core Voltage Offset allows the CPU to manage the core voltage automatically, which requires monitoring.Core Voltage and Core Voltage Offset Slider

Caution when Adjusting Voltage

  • Adjusting the CPU voltage requires more caution than changing the multipliers.
  • Too much voltage can damage your CPU, so staying within safe limits is essential.
  • For most Intel CPUs that came out within the last five years, staying at or below 1.3 volts is recommended, while 1.4 volts can be acceptable for older CPUs.

Research and Testing

  • Researching the overclocking results achieved with your CPU model and reading reviews and forum posts is essential.
  • Each CPU is different, so these data points will help you understand where the limit is.
  • After researching and testing, increase your core voltage by about 0.025 and rerun the stress test to ensure you’re within a safe temperature range.

Rinse and Repeat

Overclocking your CPU can yield significant performance improvements, but you must do it carefully to avoid damaging your hardware. Here are the steps to follow to find a stable overclock for your CPU:

  1. Start by increasing the CPU multiplier by one step at a time. This increases the CPU frequency, which is the main factor in performance gains from overclocking.
  2. As you increase the multiplier, keep an eye on the CPU temperature. It should not exceed 95 degrees Celsius, the typical thermal throttling threshold for most CPUs. Lower temperatures are better, but you may be willing to tolerate higher temperatures for better performance.
  3. To stabilize your overclock, you may need to increase the CPU voltage. Do this in small increments of 0.025 volts (or 25 millivolts) each time, using Intel’s XTU software. The most vital thing is to find a safe and stable frequency for your CPU.
  4. If your system crashes or restarts, it’s a sign that you’ve pushed the frequency too far. Go back and make some adjustments, such as lowering the multiplier or increasing the voltage.
  5. Once you’ve found your CPU’s highest stable frequency and voltage, run a stress test for at least an hour to confirm that it’s tough. If the system crashes during the trial, dial back the frequency or voltage and try again.
  6. When you’ve finished tweaking your overclock settings, save a profile in XTU so you can reapply them later if needed. This will also help you compare different overclocking locations and find the best one for your needs.

Safety Precautions

Overclocking is not without risk and can result in damage to your hardware if not done properly. It’s important to know the limitations of your hardware before attempting to overclock, as pushing it too far can cause serious and irreversible damage. Some safety precautions to keep in mind are:

  • It’s recommended to test your system stability before beginning the overclocking process, as this will help you identify any potential problems that could arise from increasing the clock speed.
  • Check the speed at which your motherboard chipset communicates with the CPU (also referred to as FSB). It plays a crucial part in determining the CPU’s general speed, measured in megahertz (MHz).
  • Identify the exact voltage of your CPU, as each processor has its own distinct voltage requirements.
  • Finally, always be mindful of the temperature and make sure you have appropriate cooling solutions in place, as overclocking generates a lot of heat which can cause serious damage if not managed properly.


Overclocking your CPU can give you a performance boost. Still, finding a stable and safe overclock requires caution and patience. Researching your specific CPU model and using stress testing software to ensure stability and avoid damaging your system is essential. In addition, monitoring the temperature and voltage parameters is crucial for a successful overclock. By performing these steps and being careful, you can achieve a stable and safe overclock for your CPU, leading to improved performance in your computing tasks.

Can all CPUs be overclocked? 

No, not all CPUs can be overclocked. Some CPUs, particularly those in laptops and pre-built systems, may be locked by the manufacturer to prevent overclocking.

What is the maximum safe temperature for a CPU? 

The maximum safe temperature for a CPU varies depending on the model and manufacturer. However, most CPUs have a thermal throttling threshold of around 95 degrees Celsius.

Can I overclock my CPU without specialized software? 

No, you need specialized software, such as Intel XTU or AMD Ryzen Master, to overclock your CPU.

Leave a Comment